Digging bucket



H. H. BARBER DIGGING BUCKET July 4, 1933.

Filed June 25, 1931 "m bucket.

Patented July 4, 1933 UNITED STATES PATENT oF Ica HARRY I-I. BARBER, OFAURORA, ILLINOIS, ASSIGNOR TO BARBER-GREENE COMPANY,

v01E AURORA, ILLINOIS, A CORPORATION OF ILLINOIS reamer BUCKETApplication filed June 25,

This invention relates to a digging bucket for ditching machines andconcerns itself more particularlywith the cutting elements and themanner of securing the same to the The cutting elements for such bucketsare usually made of some expensive material that will maintain a goodcuttingedge for a reasonabletime beforethey have to be replaced.

In the past these cutting elements have been subjected'to considerablebending strains that frequently distorted the same. Moreover,

considerable diliiculty has been encountered in replacing the cuttingelements.

It is an object of this invention to overcome I the above notedobjections in the provision of less expensive cutting elements that maybe more readily and frequently replaced, and

that eliminate to a great eXtentthe previous 10 tendency to bend, andwherein the cutting force results mainly in a compression action.

The invention comprises the novel structure and combination of partshereinafter de 1 scribed and more particularly pointed out and definedin the appended claims.

In the accompanying drawing which illustrates a preferred form of thisinvention and in which similar reference numerals refer to similarfeatures in the different views:

Figure 1 is a top plan view of a digging bucket equipped with cuttingelements involving this invention;

Figure 2 is an enlarged top plan view of one of the cutting elementsFigure 3 is a sectional view taken upon the line III-III of Figure 1looking in the direction of the arrows; and

Figure 4 is an enlarged sectional view taken upon theline IV.IV ofFigure 2 looking in the direction of the arrows.

Describing the invention in relation to the drawing, there has beenillustrated a digging bucket 1 provided with a series of cuttingelements 2. Each cutting element has a base provided with a slot 5extending inwardly from the rear edge, and the base portion upon eachside 'of the slot is provided with a rib 3 having upwardly divergingsides that terminate in a horizontal shoulder 4. The cutting or diggingportion 2'?) rises from the 1931 Serial No. 546,847.

forward portion and sides of the base. The inclined cutting portion 2?)is relatively thin in section to present a relatively sharp cutting ordigging edge as it is worn. Theslope of the cutting portion 2?) is suchthat as it wears its projection beyond the front edge of the bucket doesnot decrease in direct proportion to the wear. The interior sides of thecutting portion or tooth are bevelled as indicated at 6, while the frontpart of the tooth inclines forwardly from a point mid way of its heightas indicated at 2a. The corners that join the sides with the cuttingportion 26 are thicker than the cutting portion 26 with the result thatthey wear down slower and may form a double pick pointed tooth. Due tothe construction of the tooth,

it will be obvious that the major portion of the force exerted thereonwill be of a com-.

pressive nature and very little bending force will occur. Thiscompressive force will readily be transmitted to a relatively broadsupporting base 7 upon the bucket.

For it will be appreciated that the bevelled portions 6 of the sidesslope downwa'rdangular rib portion 3 of each tooth and centering suchtooth and fiat portions adjacent said groove for sustaining theshoulders 4 on the tooth. These base portions are provided withapertures for receiving bolts 9 whichextend through the slots 5 andwhich are provided with sufiiciently large polygonal heads 10 foroverlapping the walls of the slots. It will be noted that the head ofeach bolt fits between the side walls and against the front wall of thetooth which forms a recess for receiving a portion of each bolt head andprevents rotation thereof, and that the longitudinal axis of the boltlies substantially parallel to the line of thrust on the tooth. In orderto remove a tooth, it is only necessary to loosen its bolt when thetooth may be slid out.

I am aware that many changes may be made and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I therefore do not purposelimiting the patent granted hereon otherwise than necessitated by theprior art.

I claim as my invention:

1. A cutting tooth for a digging bucket saving a base portion providedwith a centering projection and shoulders adjacent the sides of saidprojection, said base portion merging in upwardly extending bevelledside walls connect-ed by a forwardly inclined front wall, theconstruction being such that the cutting action transmits mostly acompressive force with respect to the base.

2. A cutting tooth for a digging bucket having a base portion with acentering rib .and bearing portions adjacent the sides of the rib, saidbase merging into side walls having inwardly inclined bevelled portionsand a front wall having an upper forwardly sloping portion.

3. A cutting tooth for a digging bucket having a supporting baseprovided with a bevelled centering rib and bearing portions adjacent thesides of said rib, said base having a bolt securing aperture, said basemerging in side walls having interior sloping portions and a forwardlysloping front'wall.

4. A cutting tooth for digging buckets comprising a base portion, afront wall of substantially uniform thickness extending upwardly fromthe forward portion of the base and terminating in a cutting edge, andtaperingside portions extending upwardly from the sides of the base andinclined toward the cutting edge and adapted to reinforce and supportthe front wall and form bolt having a head and the walls of said toothforming a recess for receiving said head and preventing rotationthereof, the longitudinal axis of saidbolt lying substantiallyparallelto the line of thrust on said tooth.

6. In a digging bucket having a tooth support, a tooth having a baseresting upon said support, said base having a front wall forwardlyinclined and terminating in a cutting edge, and tapering side wallsmerging with said front wall, said side walls and front wall forming arecess, said support and base having an aperture and a bolt having itshead located in said recess and extending through said aperture andlying substantially parallel to the line of thrust upon said cuttingedge.

7. A tooth for digging buckets, comprising a base having an upwardlyextending and forwardly inclined front wall terminating in a cuttingedge, and side walls tapering in thickness and width from said base andmerging with said front wall, said side walls and front wall forming arecess adapted for receiving thehead of an attaching bolt Illinois.

HARRY H. BARBER.

